{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:COJ7MCW7CPIRKSIFHYYDQ3EQIL","short_pith_number":"pith:COJ7MCW7","canonical_record":{"source":{"id":"2307.05976","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.geo-ph","submitted_at":"2023-07-12T07:47:36Z","cross_cats_sorted":[],"title_canon_sha256":"4f35c9ddbeca84358a89155c8361e51a85b070942d177cd5d9cdb3d365da6811","abstract_canon_sha256":"c50893df5ac3e8887aa967fc52e87c5410701e50ebd7e47ebd6de732c63483ce"},"schema_version":"1.0"},"canonical_sha256":"1393f60adf13d11549053e30386c9042ebf935eacb75f25d01d6ed64db90c656","source":{"kind":"arxiv","id":"2307.05976","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.05976","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"arxiv_version","alias_value":"2307.05976v1","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.05976","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"pith_short_12","alias_value":"COJ7MCW7CPIR","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"pith_short_16","alias_value":"COJ7MCW7CPIRKSIF","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"pith_short_8","alias_value":"COJ7MCW7","created_at":"2026-07-05T06:30:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:COJ7MCW7CPIRKSIFHYYDQ3EQIL","target":"record","payload":{"canonical_record":{"source":{"id":"2307.05976","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.geo-ph","submitted_at":"2023-07-12T07:47:36Z","cross_cats_sorted":[],"title_canon_sha256":"4f35c9ddbeca84358a89155c8361e51a85b070942d177cd5d9cdb3d365da6811","abstract_canon_sha256":"c50893df5ac3e8887aa967fc52e87c5410701e50ebd7e47ebd6de732c63483ce"},"schema_version":"1.0"},"canonical_sha256":"1393f60adf13d11549053e30386c9042ebf935eacb75f25d01d6ed64db90c656","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:30:14.906486Z","signature_b64":"aaca7CMw6faBMPiHLgxLBIfk64OHWVoF9JejhywHrAhDtWlFK5K0rgzT1LwYzgZy1o9fnBmrXcUkNlO+VnvkDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1393f60adf13d11549053e30386c9042ebf935eacb75f25d01d6ed64db90c656","last_reissued_at":"2026-07-05T06:30:14.905960Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:30:14.905960Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2307.05976","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:30:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rnrj2127HR+FdlL+kmHNhGo0B+1KEiM+UMVCj8G6jvVYBfClGPf13R5MdXZwKsjKVAn4+WCbCUSaTitluhRtAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T21:39:47.894786Z"},"content_sha256":"80490a4b48698ae45e6a67dff583803584adf3aa1280915779a19b23511e8a9d","schema_version":"1.0","event_id":"sha256:80490a4b48698ae45e6a67dff583803584adf3aa1280915779a19b23511e8a9d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:COJ7MCW7CPIRKSIFHYYDQ3EQIL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Borehole fibre-optic seismology inside the Northeast Greenland Ice Stream","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.geo-ph","authors_text":"Andreas Fichtner, Andrea Zunino, Coen Hofstede, Dimitri Zigone, Lars Gebraad, Olaf Eisen","submitted_at":"2023-07-12T07:47:36Z","abstract_excerpt":"Ice streams are major contributors to ice sheet mass loss and sea level rise. Effects of their dynamic behaviour are imprinted into seismic properties, such as wave speeds and anisotropy. Here we present results from the first Distributed Acoustic Sensing (DAS) experiment in a deep ice-core borehole in the onset region of the Northeast Greenland Ice Stream. A series of active surface sources produced clear recordings of the P and S wavefield, including internal reflections, along a 1500 m long fibre-optic cable that was lowered into the borehole. The combination of nonlinear traveltime tomogra"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.05976","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2307.05976/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:30:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fNm8f9uMrAHuGcpJjaGkhQK+rn63pca8pLPIgSi46NJtCATaQQLVOIz24vuUsko188tDJjSeLBUOiXnWHgzBAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T21:39:47.895158Z"},"content_sha256":"0807bd3808886e395fc9262434b71ae66aaa22a2402db8e3e02660c3a365e684","schema_version":"1.0","event_id":"sha256:0807bd3808886e395fc9262434b71ae66aaa22a2402db8e3e02660c3a365e684"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/COJ7MCW7CPIRKSIFHYYDQ3EQIL/bundle.json","state_url":"https://pith.science/pith/COJ7MCW7CPIRKSIFHYYDQ3EQIL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/COJ7MCW7CPIRKSIFHYYDQ3EQIL/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-21T21:39:47Z","links":{"resolver":"https://pith.science/pith/COJ7MCW7CPIRKSIFHYYDQ3EQIL","bundle":"https://pith.science/pith/COJ7MCW7CPIRKSIFHYYDQ3EQIL/bundle.json","state":"https://pith.science/pith/COJ7MCW7CPIRKSIFHYYDQ3EQIL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/COJ7MCW7CPIRKSIFHYYDQ3EQIL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:COJ7MCW7CPIRKSIFHYYDQ3EQIL","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"c50893df5ac3e8887aa967fc52e87c5410701e50ebd7e47ebd6de732c63483ce","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.geo-ph","submitted_at":"2023-07-12T07:47:36Z","title_canon_sha256":"4f35c9ddbeca84358a89155c8361e51a85b070942d177cd5d9cdb3d365da6811"},"schema_version":"1.0","source":{"id":"2307.05976","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.05976","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"arxiv_version","alias_value":"2307.05976v1","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.05976","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"pith_short_12","alias_value":"COJ7MCW7CPIR","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"pith_short_16","alias_value":"COJ7MCW7CPIRKSIF","created_at":"2026-07-05T06:30:14Z"},{"alias_kind":"pith_short_8","alias_value":"COJ7MCW7","created_at":"2026-07-05T06:30:14Z"}],"graph_snapshots":[{"event_id":"sha256:0807bd3808886e395fc9262434b71ae66aaa22a2402db8e3e02660c3a365e684","target":"graph","created_at":"2026-07-05T06:30:14Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2307.05976/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Ice streams are major contributors to ice sheet mass loss and sea level rise. Effects of their dynamic behaviour are imprinted into seismic properties, such as wave speeds and anisotropy. Here we present results from the first Distributed Acoustic Sensing (DAS) experiment in a deep ice-core borehole in the onset region of the Northeast Greenland Ice Stream. A series of active surface sources produced clear recordings of the P and S wavefield, including internal reflections, along a 1500 m long fibre-optic cable that was lowered into the borehole. The combination of nonlinear traveltime tomogra","authors_text":"Andreas Fichtner, Andrea Zunino, Coen Hofstede, Dimitri Zigone, Lars Gebraad, Olaf Eisen","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.geo-ph","submitted_at":"2023-07-12T07:47:36Z","title":"Borehole fibre-optic seismology inside the Northeast Greenland Ice Stream"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.05976","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:80490a4b48698ae45e6a67dff583803584adf3aa1280915779a19b23511e8a9d","target":"record","created_at":"2026-07-05T06:30:14Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"c50893df5ac3e8887aa967fc52e87c5410701e50ebd7e47ebd6de732c63483ce","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.geo-ph","submitted_at":"2023-07-12T07:47:36Z","title_canon_sha256":"4f35c9ddbeca84358a89155c8361e51a85b070942d177cd5d9cdb3d365da6811"},"schema_version":"1.0","source":{"id":"2307.05976","kind":"arxiv","version":1}},"canonical_sha256":"1393f60adf13d11549053e30386c9042ebf935eacb75f25d01d6ed64db90c656","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1393f60adf13d11549053e30386c9042ebf935eacb75f25d01d6ed64db90c656","first_computed_at":"2026-07-05T06:30:14.905960Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:30:14.905960Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aaca7CMw6faBMPiHLgxLBIfk64OHWVoF9JejhywHrAhDtWlFK5K0rgzT1LwYzgZy1o9fnBmrXcUkNlO+VnvkDA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:30:14.906486Z","signed_message":"canonical_sha256_bytes"},"source_id":"2307.05976","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:80490a4b48698ae45e6a67dff583803584adf3aa1280915779a19b23511e8a9d","sha256:0807bd3808886e395fc9262434b71ae66aaa22a2402db8e3e02660c3a365e684"],"state_sha256":"d7cedfd8b7c91c9ad09ebac31298d5b1571c87f8834266dcc948d76f79890441"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/fMoQqakRTcSHrNQNqp+f3dW+0ASk5r+uFUKH9b7xGVOzy2Ea7ZVdC4/gTmGz0crHyRxtm+RyoHFuszC3VAmAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-21T21:39:47.897681Z","bundle_sha256":"d1d6b529d2054905fab7e21178b2eeda79809febb7b2503c7d2ab71f684637ec"}}